Return bend and terminal fitting



Nov. 1, 1927.

S. THURSTENSEN RETURN BEND AND TERMINAL FITTING Filed Sept. 11, 1925 2 Sheets-Sheet 1 10 \Lmm gwpenl of 30km zmslemsm W Wm Nov. 1, 1927. 1,647,321

v s. THURSTENSEN RETURN BEND AND TERMINAL FITTING Filed Sept. ll, 1925 2 Sheets-Sheet 2 tion.

Patented Nov. 1, .1927. I

UNI-TED, STATES sonnn THURSTENSEN, or LOUISVILLE,

v 1,647,321 PATENT OFFICE.

KENTUCKY, ASSIGNOR TO'HENRY VOG'I MACHINE 00., OF LOUISVILLE, KENTUCKY.

RETURN BEND AND TERMINAL FITTING.

Application filed September 11, 1925. Serial No. 55,809.

This invention relates to improvements in return bends and terminal fittings, p'artlcularly to improved tube fittings adapted for use in the construction of heat exchangers for high temperature work in 011 cracking stills.

drop forged steel tube fitting having'a back outlet supplied with ground seatplugs and means for firmly holding the plugs in posi- A further object of this inveritioh is to provide means for grinding or revolvmg the plug while in position in the fitting. 1

By this invention means .are further ;pro-

vided for easy access to the tubes for cleaning purposes. A

In the drawings,

Fig. 1 illustrates a top plan of a return bend. Fig. 2 represents a side sectional elevational view of the return bend.

Fig. 3 illustrates a top plan view bf a ter minal fitting.

Fig. 4 represents a side sectional elevational view of the terminal fittlng.

Numeral 1 designates the body of the return bend preferably made of solid forged. steel having bosses 2, 3 and 4 and opemngs 5' drilled through the bosses 2, the openings in the bosses 2 being grooved as disclosed at 6 and 7 in order to receive tubes 8, which are inserted and rolled .into the grooves 6 and thereby forming several shoulders on the tube as at 9 and'lO thus preventing the tube from slipping in the openings 5, while under high pressure. A passage 11 and 15 is drilled through the boss 4, thus completing the opening in the return bend. Ordiniarily the pas- .sage 11 in the boss 4, not being required, is

closedby means of a plug 12, which is screwed tightly intothe opening 11 by means of threads 14, and pre erably electrically welded to the for-gin 1,'the electrical welding beingdesignated y the numeral 13. The

opening 11 is required for the purpose of 15 in the return.

drilling the passageway fitting 1 and obviously is not required after this operation has beeh completed.

The bosses 3 of the return bend are'drilled with openings 16, the openings being provided preferably with straight aeme threads as disclosed at 17, adapted to receive a threaded cap 18. A ortion of the opening or passageway 16 is ormed with a ground An object of this invention is to provide a ting preferably adapted for use in oil crackconed seat 19 for the purpose ofreceiving a ground joint cone plug 20. The cone plug 20 is adapted to be inserted and tightly fit the ground seat portion 19 of the forging 1', the

threadedcap 18 being adapted to press tightly against the plug 20, thereby firmly holding it in desired position. shank 21 ordinarily having a square-end 22 is provided on .plug 20, extending through the cap 18 and-is adapted for the'purpose of grinding the cone plug while in position in the return bend forglng.

Figures 3 and 4 illustrate a terminal .fit-.

ing stills where high working temperatures are common. Numeral 24 designates a flanged coupling common to terminal fittings, while 23 represents a passageway leading to the usual outlet or inlet tubes, the remaining portions .of the terminal fittings are preferably constructed in a similar manturn bend as disclosed in Figures 1 and 2 and as described above. The terminal fittings or, what may ,be termed inlet or outlet fittings, are likewise preferably made of drop forge steel and drilled through the solid metal.

In operation this invention provides a drop forged steel return bend or a terminal fitting having a ground joint back 'outlet. It has been determined from ex eriment that ner to the corresponding portions of the rebends provided with standard apering pipe threads with the back outlets, are inefiicient, in that the necessary use of unskilled labor frequently crosses the thread, thereby ruining the return bend. This invention calls ments to be highly efficient, particularly upon high temperature work required in oil cracking stills, although it is not intended high temperature work.

What I claim is: A .pipe fitting having an aperture therethrough provided'with a conical valve seat to confine the use of this invention wholly to and with a cylindrical screwthreaded part extending with unbroken surface from the Wide end of said seat, a conical valve plug positioned in said seat and having a cylindrical stem integral with said plug and extending perpendicularly from the center thereof, a holder member rotatableon said stem and screwthreaded into said part to contact with I said plug and having a central polygonal mamai boss extending as a hub around said stem, the stem projecting beyond the top of said hub and having the projecting partsquared to receive a Wrench said member being slidable freely along said stem and over the said squared part thereof.

In testimony whereof I afiix my signature.

SOREN THURSTENSEN. 

